21302421343 has 16 divisors (see below), whose sum is σ = 24775306560. Its totient is φ = 17938907136.

The previous prime is 21302421341. The next prime is 21302421347. The reversal of 21302421343 is 34312420312.

It is a cyclic number.

It is not a de Polignac number, because 21302421343 - 2¹ = 21302421341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302421341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50223 + ... + 212431.

It is an arithmetic number, because the mean of its divisors is an integer number (1548456660).

Almost surely, 2^21302421343 is an apocalyptic number.

21302421343 is a deficient number, since it is larger than the sum of its proper divisors (3472885217).

21302421343 is a wasteful number, since it uses less digits than its factorization.

21302421343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162546.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21302421343 its reverse (34312420312), we get a palindrome (55614841655).

The spelling of 21302421343 in words is "twenty-one billion, three hundred two million, four hundred twenty-one thousand, three hundred forty-three".